ARE THE FOLLOWING CONTRACTS OF SALE VALID OR NOT? GIVE A REASON. CITE YOUR BASIS.

1. SALE OF ONE'S KIDNEY AS A DONOR AT THE NATIONAL KIDNEY INSTITUTE FOR THOSE DESPERATE OF AN ORGAN TRANSPLANT. THE DONEE PAID P250,000.00 AND THE BALANCE OF P250,000.00 WILL BE PAID AFTER THE SUCCESSFUL SURGERY.

2. SALE OF A CONDO UNIT THAT YOUR DYING LOLO HAS ALREADY PROMISED TO YOU BY MENTIONING THE SAME IN HIS LAST WILL AND TESTAMENT. YOUR BUYER ALREADY PAID YOU 100% OF THE P4.5MILLION PURCHASE PRICE.

3. SALE OF THE MONTERO SPORT THAT YOUR MOM GIFTED TO YOUR DAD ON THEIR 15TH WEDDING ANNIVERSARY LAST YEAR. YOUR DAD SOLD THE VEHICLE WITHOUT TELLING YOUR MOM SINCE SHE IS WORKING NOW IN DUBAI. (conjugal property)